Ok, above, I mentioned universes being "clouds". Well, imagine the multiverse being shaped like a rose curve:
Each "leaf" would be an ever expanding universe. The rose curve equation displays each petal as k or 2 k with k being infinity. Note how they all meet at 0,0. To time travel, you'd use math and the proper device to create a line as shown above. You could then move back and forth on that line to pinpoint your location.
Just a theory.

Each "leaf" would be an ever expanding universe. The rose curve equation displays each petal as k or 2 k with k being infinity. Note how they all meet at 0,0. To time travel, you'd use math and the proper device to create a line as shown above. You could then move back and forth on that line to pinpoint your location.
Just a theory.